Technetium-99m is the world’s most commonly used medical isotope, used for over 30 million medical diagnostic procedures annually. But recent years have seen severe worldwide shortages and price spikes…

Some of the isotopes we find here on Earth were created in supernova explosions like this one.
NASAJanuary 11, 2013

If you’ve ever studied a periodic table of the elements (see below), you’re probably already aware that this table reveals a great deal about the chemical properties of the atoms that make up our world…